With that ARX, and the following lisp code which loads the ARX module, connects to the ActiveX interface from adskUnSupp ARX, and loads it's type library to enable the Block Description Property to be set directly via a lisp function call.

;assume the utilities are installed at ; C:\Program Files\Autodesk\ADNUtilities2013_X64\AutoCADControls\

With that ARX, and the following lisp code which loads the ARX module, connects to the ActiveX interface from adskUnSupp ARX, and loads it's type library to enable the Block Description Property to be set directly via a lisp function call.

;assume the utilities are installed at ; C:\Program Files\Autodesk\ADNUtilities2013_X64\AutoCADControls\